Can diamond book



(N0 Model.)

13. W. DOUG LASS.

Patented Mar. 14, 18 82.

GORE LIFTER AND GUIDE FOR ANNULAR ROGK' DBILLS.

WWQM 2m V and l MA.

% veg e N. PETERS. Phm-ulhc m her, Washinglan, D4 04 emcee.

SAMUEL DOUGLASS, OF NEW YORK, N. Y., ASSIGNOR TO THE AMERI- CAN DIAMOND ROCK BORING COMPANY, OF SAME PLACE.

CORE LIFTER AND GUIDE FOR ANNULAR ROCK-DRILLS.

SPECIFICATION forming part of Letters Patent No. 254,939, dated March 14:, 1882,

- Application filed December 19, 1881. \No model.)

To all whom it may concern:

Be it known th at I, SAMUEL W. DOUGLASS, of New York city, in the county of New York and State of New York, have invented a new and Improved Core Litter and Guide for Annular Rock-Drills; and I do hereby declare that the following, taken in connection with the accompanying drawings, is a full, clear,

and exact description thereof.

Figure 1 is a longitudinal section of part of the core-barrel, the connectingcoupling, the core-lifter. the guide-ring, and part of the drillhead. Fig. 2 is a transverse section of Fig. l on the line a" 9 Fig. 3shows a sectional view of an alternative form for the guide-ring.

Like letters indicate like parts in both fignres.

A is the drill-head. B is the coupling between the drill-head and the core-barrel in which the core-lifter is placed. 0 is the corebarrel. A and B are rigidly connected by screw-threads, (shown at a (4,) and B and G are rigidly connected by screw-threads, (shown at I) 1);) but I do not limit myself to the precise shape of the coupling B, for it may be varied from that shown in the drawings. On the inside periphery of the coupling B, Icut out circumferentially a square recess, (shown at-c,)

leaving the square shoulder d. Below this first recess I cut out also circumferentially another recess, (shown at 0,) thereby producing the shoulder f. This second recess, however,is not square, but is tapering inwardly on a true circumferential taper toward the center of the coupling from the shoulderfat the top downwardly until the taper terminates at the shoulder 1 g, formed by the upper end of the drillhead A.

D D is a steel ring, the inside diameter of which is the same as that of the coupling B at the unrecessed part thereof, and the external diameter is such that it will easliy fit into the square recess cand rotate therein.- The upper edge of this ring is square to correspond with the shoulder d. This ring has sections, preferably four in number, out out of it from the bottom upwardly so far as the shoulderff, leaving the four downwardly-projecting fingers or guides D. (Seen in section in Fig. 2.) There is a space between them and the wall of i D, Iform the wedges E.

the tapered recess. In this space I place the split contractible steel ring E. The ends of this ring (seen at i, Fig. 2) are suffici ently separated to allow the necessary contraction and expansion of the ring as it moves up and down in the tapered recess 6. V

On the ring, and so located that they shall loosely fit into the spaces between the fingers The ring E is so tempered that by its elasticity the inner surfaces of the wedges IE will slightly project beyond the face of the fingers D, and the thickness of the wedges is such that when the ring commences to move through the beveled recess toward its bottom the back or outer sides of the wedges will impinge on the inclined wall of the tapered recess, and the wedges will thus be crowded toward the center of the coupling, and the inner faces of the wedges will be projected more and more as the ring moves toward 7 the lower end of the recess through the spaces between the fingers D. I prefer, in order to save wear, that the ring E should not touch the wall of the recess when it is in the upper end of the recess.

Instead of the ring D having the sections cut out cf it, leaving the fingers D, it may have slots cut in it, through which the wedges shall project and act, as seen in Fig. 3,jj showing the slots. If the ring he thus made, the relations between the split ring, to which the wedges are attached, the tapered recess, and the slotted ring must be such as to allow the wedges to slip freely to the bOttOlDl of the recess.

By the use of the guide-ring D, provided with its guides D, between which the wedges work, I avoid the danger of broken or ragged core jamming or being caught by the shoulderof the wedges and of the upper and lower ends of the recess in which the wedges work, because the slot or spaces between the fingers or guides D on this ring being made quite narrow-that is, only wide enough for the wedges to work thereiu-and the fingers or guides occupying all the spaces between the wedges, they will prevent pieces of broken or ragged rock from getting under the said shoulders, or either of them.

The operation is as follows: As the boring progresses the drill-head, followed by the coup ling and the corcbarrel, descends, and after sufticient boring has been done the core lies within the drill-head, the coupling, and the corebarrel. The wedges E, by the elasticity of the ring E, are during the boring operation pressed to some degree against the core, and sufficiently so to cause them to remain stationary, and they also hold the fingers D and ring Dstationary, the coupling 13 revolving around them; and during the introduction of the drill and during the boring the fingers or guides D will guide the core and keep'it and broken and ragged pieces of the rock away from the shoulders of the Wedges and of the recess in which they lie. When the retraction takes place the impingement of the wedges against the core causes them to remain stationary while the coupling rises, and coming in contact with the inwardly and downwardly tapering wall of the recess, they are forced in toward the center of the coupling, more and more firmly grasping the core, until the pull being continued the core is broken off and goes up with the wedges.

Among the advantages peculiar to my corelifter is the feature that my wedges and guides do not revolve, thus avoiding the grinding of the wedges and guides; and also the feature that by my guides and ring D, I afford a practically continuous inner surface or tube in which there are practically no shoulders against which broken or ragged core can jam.

1 claim as new- 1. The combination of a core-barrel, a coup-' ling, a ring fitting into an internal recess in the coupling, provided with separated guide projections or fingers, a split ring working in a tapered recess in the coupling, and provided with wedges which project inwardly between the guide-fingers, and a drill-head, all combined substantially as and for the purposes set forth.

2. A drill-rod coupling, recessed on its inner periphery, and a guide-ring fitting into the recess, in which there are slots, through which the core-grasping wedges act substautially as and for the purposes set forth.

3. The combination of a slotted ling supported in a recess in the coupling, through the slots in which ring wedges on a contractible ring act, said contractible ring working in a tapered recess in the coupling, all combined substantially as and for the purposes set forth.

SAMUEL W. DOUGLASS.

\Vituesses:

PHILLIPs ABBOTT, JOHN H. IVEs. 

